Does the 'perfect' day exist?

New research from the University of Pennsylvania in the United States show there are three big things that happen when people experienced a better than average day.But there were also things that make your day worse even though you can't avoid it forever — like housework — so how do you decide what the trade offs are? And in a world where we're encouraged to optimise every inch of our lives, is a perfect day really something to strive for?